Water Temperature for Fish? Need a Heater for my Fish Tank?

What is the ideal water temperature for tetra fish? - Quora
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I hope your betta is ok!!! You need to have a heater, thermometer, and water conditioner for your betta. The ideal water temperature for your betta is 75F - 82F. Please do Not put your fish in a warm cup of tap water to warm it up. Warm tap water can be over 90F which can harm or kill your fish. Remove your fish along with some of his tank water in a large cup at least the size of the container you bought him in. Clean the tank, put the heater in the clean water and put the conditioner drops in which help remove the chlorine from tap water which can harm your fish. Follow the instructions on the betta water conditioner so you know how many drops to put in for your size tank, Make sure the thermometer says between 75F - 82F before you put your fish back in his tank. You can just add the water from his cup to the tank as well. Keeping the same water temperature after cleaning is very important. The heater will keep it consistent, and the thermometer will let you know for sure. Good luck!!!
Why is Water Temperature Important For Your Fish? - The Pond Blog
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Studies have shown a direct relationship between metabolic rates and water temperature. This occurs as many cellular enzymes are more active at higher temperatures 18. For most fish, a 10°C increase in water temperature will approximately double the rate of physiological function 16. This increase in metabolic rate can be handled by some species better than others. Increased metabolic function can be noticed in respiration rates and digestive responses in most species. Increased respiration rates at higher temperatures lead to increased oxygen consumption, which can be detrimental if rates remain raised for an extended period of time. Furthermore, temperatures above 35°C can begin to denature, or breakdown, enzymes, reducing metabolic function 18. Spawning temperatures for different freshwater fish
Photo provided by FlickrFish Habitat (water temperature) - USDA Forest Service
Photo provided by FlickrFish Habitat (water temperature) - U.S. Forest Service
Photo provided by Flickr
When fish suspend in the water column it is usually by water temperature. Using a temperature probe will allow you to find the depth of the correct water temperature for the species you are targeting. Using the Fish Hawk Probe on your downrigger, lower the probe close to the bottom, observing the water temperature on the display as you raise the probe to the surface. Or using the Fish Hawk TD, simply attach the TD to a fishing line or the downrigger cable and lower it to the bottom. When you retrieve the TD, press the "VIEW" button and it will show you the water temperature every five-feet.In areas where water masses of varying temperature meet, fish often begin making eggs and sperm and displaying reproductive behavior such as changing position in the water column and forming schools. Sudden changes in water temperature will sometimes trigger migrations to spawning grounds.Fish are unable to regulate their body temperature, so they are influenced by the temperature around them. If the water is warm, fish metabolism accelerates, feeding and respiration increases, and there is a general increase in movement. If the water is cooler, fish become lethargic and tend to be inactive. However, this is also true for other water creatures such as the insects that some fish eat, and certain fishes have adapted to this fact by specializing in slower kinds of prey. This is why bass and carp fishing is done in winter. These are fish specializing in slow-moving prey, and they are more active in cold water than in warm water. In general, however, most types of fish prefer faster prey and are more active in warmer water.This is the main distinction between the cold-water and warm-water fishes. Cold-water fishes may begin breeding at very low temperatures – only a few degrees above freezing for salmon, trout, and grayling. Whereas many warm water species start to breed only at much higher temperatures, and so are successful only in places where high temperatures are available long enough for breeding and early development.